cell membrane transport

• What is the main function of the cell membrane?

  It regulates the transport of substances in and out of the cell.
• How do phospholipids contribute to the structure of the cell membrane?

  Phospholipids form a bilayer that makes up the cell membrane.
• What role do proteins play in the cell membrane?

  Some proteins have channels that allow certain substances to pass through the membrane.
• What term describes the ability of the cell membrane to allow certain substances to pass while blocking others?

  Selectively permeable.
• Which substances can pass through the cell membrane?

  Glucose, oxygen, and water can pass through the membrane.
• What is a concentration gradient?

  A concentration gradient is the difference in concentration of a substance between two areas.
• How does the concentration gradient affect the movement of molecules?

  The greater the concentration gradient, the faster the movement of molecules.
• What is diffusion?


  Diffusion is the movement of substances from a high concentration to a low concentration.
• Why is diffusion considered a passive transport process?


  Because it does not require energy to occur.
• What is osmosis?


  Osmosis is the movement of water from a high water concentration to a low water concentration across a selectively permeable membrane.
• What happens to a cell in a solution with a higher water concentration?

  Water will move into the cell by osmosis.
• The concentration gradient is the difference between the concentrations of molecules on either side of the membrane.